KR20150041704A - copper clad wire and control signal transmission cable including the same - Google Patents

Abstract

Disclosed are a copper clad wire and a control signal transmission cable including the same. In the copper clad wire and the control signal transmission cable including the same according to the present invention, provided is the copper clad wire with an electromagnetic shielding property which is equal to or higher than the electromagnetic shielding property of an existing copper clad wire without increasing an outer diameter, capable of optimizing the thickness of used copper. Cable productivity is improved by reducing disconnection probability in a braiding process. The workability of the braiding operation and shielding performance are maintained. Manufacturing costs are reduced by reducing processing costs and material costs while securing the productivity of a cable braiding. Also, the copper strip welding workability of the copper clad wire is improved. The convenience of transporting and laying operations is improved by reducing the weight of a cable.

Description

The present invention relates to a copper clad wire and a control signal transmission cable including the same,

The present invention relates to a coaxial wire and a control signal transmission cable including the coaxial wire. More particularly, the present invention relates to a coaxial wire and a control signal transmission cable including the same, The present invention relates to a coaxial wire rod capable of exhibiting miracle shielding characteristics and a control signal transmission cable including the coaxial wire rod.

Due to the recent rise in international copper prices and the rise in raw material prices, the cost of purchasing copper, which is the main material of cable conductors and braiding, has increased so much that copper can be substituted for copper in terms of price and performance The need for materials is increasing.

The biggest problem in the development of alternative materials is that it is difficult to obtain a material with electrical properties equivalent to that of copper, but with sufficient mechanical and physical properties to provide sufficient reliability for use with cable conductors and braids.

That is, in the development of cable conductors and braided materials, whether or not the mechanical and physical characteristics have sufficient reliability to be used for the cable, while having a level of conductivity equal to or satisfactory to copper, is a standard of product design. Research is underway to develop and cable applications.

Copper, which has been used most often as a cable braiding material, has been used as a main material for a long time due to its high conductivity and low price, which are optimal conditions for cable materials.

However, as copper prices have risen more than three times as a result of rising raw material prices, research is underway to use aluminum, which is less expensive and less expensive than copper, as a braided material.

However, since aluminum has lower electrical properties than copper and has lower physical properties, particularly elongation and strength, it has a problem that it is difficult to meet the characteristic that wire breakage does not occur in a severe braiding process as compared with a twisting process of a conductor. In the case of the aluminum alloy, although it exhibits physical characteristics similar to those of copper according to the alloy series, it has a problem that it is difficult to apply because the workability is reduced and the manufacturing cost is increased in the drawing process.

In addition, when aluminum is used as a cable shielding conductor, there is a problem that an oxide film generation problem that obstructs electric conduction due to a rapid reaction speed, a problem caused by a relatively large amount of heat compared with copper, There is a problem such that the cross-sectional area becomes large when utilized.

Accordingly, there is a need for a shielding wire capable of improving light weight and workability and exhibiting an electromagnetic shielding property equal to or greater than that of a wire made of conventional copper alone without increasing the outside diameter.

The embodiments of the present invention are intended to provide a copper wire which can exhibit electromagnetic shielding properties equal to or greater than that of a wire made of conventional copper only without optimizing the thickness of the copper used and increasing the outer diameter.

Further, it is intended to improve the productivity of the cable by lowering the disconnection probability in the braiding process, and to maintain the workability and shielding performance of the braid.

In addition, we aim to secure the productivity of cable braiding and lower manufacturing costs by lowering material and processing costs.

In addition, the copper strip welding workability of the copper wire rod is improved, and the weight of the cable is lightened to ensure the convenience of transportation and laying work.

According to an aspect of the present invention, there is provided an antenna device including an extension made of a conductive material and an outer line surrounding the extension, the outer line made of copper, wherein shielding is performed at a frequency of 1.75 MHz to 250 MHz, and a tensile force of the conductive material forming the extension is 0.15 kgf to 4 kgf. The coiling wire used as the braiding layer for shielding may be provided.

의 수식에 의해 정해지는 값을 가지도록 구성될 수 있다.The thickness of the outer line is

The value of which is determined by the following equation.

The conductive material may be formed of any one of carbon fiber, meta-aramid, aluminum, nickel, magnesium, titanium, and CNT.

The total diameter including the extension line and the outside line may be 0.1 mm to 0.4 mm.

The coiling wire according to the present invention may further comprise a plating layer plated with any one of Pb, Sn, Zn, Ag and Ni or an alloy thereof to prevent corrosion on the external line.

According to another aspect of the present invention, there is provided a signal transmission apparatus comprising: a plurality of signal transmission units each having a conductor layer formed by twisting, aggregating, or compounding a plurality of element wires and an insulating layer insulating the conductor layer; Wherein the braided layer is woven with a coaxial wire comprising an extension made of a conductive material and an outer wire surrounding the extension and made of copper, wherein the coaxial wire is cut at a frequency of 1.75 MHz to 250 MHz And the tensile force of the conductive material forming the extension is 0.15 kgf to 4 kgf.

A separator tape surrounding the conductor layer is provided, and the insulation layer may be formed by extruding the separator tape so as to surround the separator tape.

The control signal transmission cable according to the present invention further comprises a filler filled to maintain a circular shape between the plurality of signal transmission units and a binder tape wrapping the periphery of the plurality of signal transmission units and the filler, The signal transmission unit, the filler, and the binder tape may form a core portion.

The control signal transmission cable according to the present invention may further include an inner sheath layer disposed between the core part and the braided layer and surrounding the core part.

The control signal transmission cable according to the present invention may further comprise an outer sheath layer surrounding the outer side of the braided layer.

의 수식에 의해 정해지는 값을 가지도록 구성될 수 있다.The thickness of the outer line is

The value of which is determined by the following equation.

The conductive material may be formed of any one of carbon fiber, meta-aramid, aluminum, nickel, magnesium, titanium, and CNT.

The total diameter including the extension line and the outside line may be 0.1 mm to 0.4 mm.

The control signal transmission cable according to the present invention may further comprise a plating layer plated with any one of Pb, Sn, Zn, Ag, and Ni or an alloy thereof to prevent corrosion on the external line.

The embodiments of the present invention can provide a copper wire rod capable of exhibiting electromagnetic shielding properties equal to or greater than those of conventional copper wire alone without optimizing the thickness of the copper used and increasing the outer diameter.

Further, it is possible to improve the productivity of the cable by lowering the disconnection probability in the braiding process, and to maintain the workability and shielding performance of the braid.

In addition, productivity of cable braiding can be ensured and manufacturing cost can be lowered by lowering material cost and processing cost.

In addition, it is possible to improve the workability of the copper strip welding of the copper wire rod and to reduce the weight of the cable, thereby ensuring the convenience of transportation and laying work.

1 is a schematic view showing a process of manufacturing a coiling wire according to an embodiment of the present invention;
2 is a perspective view showing a cable to which a coaxial wire is applied according to an embodiment of the present invention.
3 is a cross-sectional view showing a cable to which a coaxial wire according to an embodiment of the present invention is applied
4 is a perspective view illustrating a cable to which a coaxial wire according to another embodiment of the present invention is applied.
5 is a cross-sectional view showing a cable to which a coaxial wire according to another embodiment of the present invention is applied
6 is a perspective view showing a cable to which a coaxial wire according to another embodiment of the present invention is applied.
7 is a cross-sectional view showing a cable to which a coaxial wire according to another embodiment of the present invention is applied

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described herein but may be embodied in other forms. Rather, the embodiments disclosed herein are provided so that the disclosure can be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Like reference numerals designate like elements throughout the specification.

1 is a view illustrating a process of manufacturing a coiling wire according to an embodiment of the present invention.

Referring to FIG. 1, a coaxial wire 10 according to an embodiment of the present invention may include an extension wire 12 made of a conductive material, and an outer wire 14 surrounding the extension wire and made of copper.

The coiling wire 10 may be used to weave a braided layer for performing an electromagnetic shielding function. The coiling wire 10 according to the present invention may exhibit the same shielding effect as a wire made of only copper of the same size .

Specifically, the thickness of the copper that forms the outer line 14 of the copper clad wire 10 can be determined in consideration of the skin effect. Here, the skin effect refers to the phenomenon that the current density becomes smaller and most of the current flows on the surface of the conductor because the magnetic flux professor is larger in the cross section of the conductor through which the alternating current flows.

When an electromagnetic wave enters a material having loss such as copper, it does not enter the inside due to a skin effect, but stays only in the vicinity of the surface. At this time, an average penetration depth of the electromagnetic wave penetrates the skin depth or penetration depth).

The depth of penetration of copper can be determined by Equation 1 below.

μ = μ ₀ = 4π x 10 ^-7 H / m

σ = 5.8 x 10 ⁷ S / m

Table 1 shows the penetration depths of the copper by the frequency obtained by the equation (1).

Frequency 60Hz 100Hz 10 kHz 1MHz 100MHz Skin Depth 0.85cm 0.66cm 660 m 66μm 6.6 m

Based on the results shown in Table 1, for example, at a frequency of 1.75 MHz or higher, a current flows only at 0.05 mm from the outermost surface of the copper wire rod 10 due to the skin effect of the current, Of copper wire 14 is used, the same shielding effect as the wire material made of only 0.2 mm of copper can be exhibited.

However, in this case, the tensile force of the outer wire 14 made of copper during the braiding may be weak, which may result in a reduction in the machining speed and workability due to disconnection or distortion of the copper outer wire 14. In the case of a copper clad aluminum wire ) Or a copper clad steel wire (CCS).

 Accordingly, the coaxial wire 10 according to the embodiment of the present invention limits the thickness of the outer wire 14 made of copper to a portion where the current flows due to the skin effect so as to perform shielding at a frequency of 1.75 MHz to 250 MHz, As the extension line 12 of the wire rod 10, a conductive material having a tensile force of 0.15 kgf to 4 kgf, which has good production workability, is used in order to reinforce the tensile force.

If the tensile force is less than 0.15 kgf, the efficiency of the work is lowered due to frequent disconnection during the shielding operation. If the tensile strength is larger than 4 kgf, there is a problem that the workability is deteriorated due to the lifting phenomenon during the braiding process of the product having a small outer diameter. Therefore, in the present invention, it is preferable that the tensile strength of the conductive material applied to the extension 12 is 0.15 kgf to 4 kgf.

The extension 12 may be formed of any one of carbon fiber, meta-aramid, aluminum, nickel, magnesium, titanium, and carbon nano tube. That is, it is preferable to use a conductive material having a tensile strength in the range of 0.15 kgf to 4 kgf and lighter than copper.

The total diameter of the coaxial wire 10 including the extension wire 12 and the outer wire 14 may be 0.1 mm to 0.4 mm. In order to prevent corrosion of the outer wire 14, Pb, Sn, Zn, Ag, or Ni, or an alloy thereof.

1, the manufacturing process of the coplanar wire 10 will be described in more detail. First, a rod made of the conductive material, that is, an outer wire 12 made of a copper strip is wrapped around the outer wire 14, (Tungsten Inner Gas) welder (19).

More specifically, the welding is carried out in a welded part 17 which is shielded from the outside in the form of a box. Specifically, it is necessary to minimize the inflow of outside air, that is, oxygen, into the welded portion 17, and to minimize the outflow of Ar (argon) gas used for TIG welding.

At this time, the Ar gas is injected through the gas injector 18 so that the Ar gas is continuously filled therein. The reason why the Ar gas is supplied is to prevent the occurrence of excessive arc caused by oxygen during the TIG welding, to further stabilize the welding, and to fill the inside of the coiling wire after welding with Ar gas.

Also, when oxygen is introduced into the inside, the welded portion 17 should be kept in a sealed state since it oxidizes the surface of the rod made of a conductive material and the surface of the copper strip to delay cladding.

Thereafter, the copper wire rod 10 is wire-drawn while it is repeatedly passed through the wire dies 40. The copper wire rod 10 having a desired shape and diameter can be obtained through the drawing process.

At this time, the fresh die 40 is provided with a die case 43 in the form of a cylindrical body. Inside the die case 43, a die tip 45 Can be fixedly installed.

When a wire rod having a large diameter enters through the wire rod inlet 47 of the die tip 45 having the above structure, the wire rod having a thinner diameter comes out through the wire rod outlet 49, ) Can be made to have a desired shape and diameter, and the bonding strength between the extension 12 and the external line 14 can be increased.

The copper wire rod 10 obtained through the drawing can obtain a material required by the heat treatment process. In the present invention, the heat treatment is performed by the continuous process.

The heat treatment method can be classified into various kinds according to the classification standard, and it can be classified into the continuous method and the fixed method depending on whether the material to be annealed is moved or not.

The continuous type is a method of adjusting the material by fixing the temperature and the passage time of the material, and it has a disadvantage of increasing the installation space, but it can easily satisfy the required physical characteristics. On the other hand, the batch method requires three steps of heating, holding, and cooling after charging the material, so it takes a long time and it is not easy to satisfy the physical characteristics.

Although the present invention has been described with reference to a tubular furnace (50), it is not limited to the heat treatment method, and a copper wire rod (10) can be manufactured using another heat treatment machine.

Specifically, the heat treatment temperature according to the present invention can be performed at 220 to 560 ° C in order to remove the residual stress due to work hardening. The reason for the wide temperature range is that the heat treatment time Further, since the small wire diameter (a) of the copper wire rod 10 also functions as a large variable, the heat treatment temperature is limited within a wide range as described above.

 After coiling, it is wound around the bobbin (60) and collected to produce the coiling wire (10).

The produced coplanar wire 10 according to the present invention can be applied to cables used in various fields, and in particular, can be used as a braid for shielding a control signal transmission cable.

FIG. 2 is a perspective view illustrating a cable to which a coaxial wire according to an embodiment of the present invention is applied, FIG. 3 is a cross-sectional view illustrating a cable to which a coaxial wire according to an embodiment of the present invention is applied, Fig. 8 is a perspective view showing a cable to which a coiling wire according to another embodiment is applied. FIG. 5 is a cross-sectional view illustrating a cable to which a coaxial wire according to another embodiment of the present invention is applied, FIG. 6 is a perspective view illustrating a cable to which a coaxial wire according to another embodiment of the present invention is applied, Sectional view showing a cable to which a coaxial wire according to another embodiment of the present invention is applied.

1 to 7, a control signal transmission cable 1000 according to the present invention, to which the coaxial wire 10 is applied, includes a conductive layer 112 formed by twisting, aggregating, or compounding a plurality of wire rods 20 A plurality of signal transmission units 110 having an insulating layer 116 for insulating the conductor layer 112 and a plurality of signal transmission units 110 formed outside the plurality of signal transmission units 110 to perform a shielding function, (140).

The conductor layer 112 may be formed of a stranded wire 20 made of any one of copper, aluminum, aluminum alloy or copper wire stranded, aggregated or combined.

A separator tape 114 may be provided on the outer side of the conductor layer 112 to surround the conductor layer 112. The separator tape 114 is not essential and can be omitted especially when the conductor layer 112 is made of fine wires.

When the separate tape 114 is provided, the insulating layer 116 may be extruded to surround the separate tape 114.

The insulating layer 116 is made of a material having an insulating property and an impact resistance property, and covers and protects and insulates the conductive layer 112.

Specifically, the insulating layer 116 may be formed of a material selected from the group consisting of silicone, cross-linked polyethylene (XLPE), crosslinked polyolefin (XLPO), ethylene-propylene rubber (EPR) Polyvinyl chloride (PVC), or a mixture thereof.

The conductor layer 112, the separate tape 114 and the insulating layer 116 constitute one signal transmission unit 110 and the control signal transmission cables 1000 and 1000-1 shown in FIGS. Three signal transmission units 110 may be provided as shown in FIG. 6 and FIG. 7, or two signal transmission units 110 may be provided like the control signal transmission cable 1000-2 shown in FIGS. 6 and 7, The number of the signal transmission cables 1000 may vary depending on the field to which the signal transmission cable 1000 is applied, the use environment, the use, and the like.

A filler 122 is filled between the plurality of signal transmission units 110 to maintain a circular shape and a binder tape 124 surrounding the plurality of signal transmission units 110 and the filler 122 surrounds the filler 122, May be provided. Here, the plurality of signal transmission units 110, the filler 122, and the binder tape 124 constitute the core unit 120.

The filler 122 functions to prevent circular penetration and gas penetration of the core 120, and is preferably made of a non-hygroscopic material.

The binder tape 124 is mainly made of a PET material but is not limited thereto. The binder tape 124 serves as a core fixing member fixing the shape at the outermost part of the core part 120.

The inner sheath layer 130 may be provided on the outer side of the core 120. The inner sheath layer 130 is used for the purpose of protecting the conductor layer 112 inside of the inner sheath layer 130 by absorbing an external impact but also for the purpose of flame retardation and the like. However, the inner sheath layer 130 is not an essential element in the control signal transmission cable 1000, 4 and the control signal transmission cable 1000-1 shown in Fig.

As the inner sheath layer 130, thermoplastic and thermosetting materials such as PVC, HF4-1, SHF1, and chloroprene can be used.

A braided layer 140 may be provided on the outer side of the inner sheath layer 130. If the inner sheath layer 130 is omitted, the outer side of the core 120, i.e., the outer side of the semi-finished product or the insulating layer 116, Respectively.

The braided layer 140 may be woven with a coaxial wire 10 including an extension wire 12 made of a conductive material and an outer wire 14 surrounding the extension wire 12 and made of copper . The copper thickness of the coaxial wire 10 can be determined by calculating the penetration depth of the electromagnetic wave due to the skin effect by Equation (1).

As the small wire diameter a of the coaxial wire 10 increases, the thickness of the braided layer 140 formed by weaving the wire increases, so that the entire outer diameter of the control signal transmission cable 1000 becomes larger and the weight becomes larger .

Therefore, the small wire diameter a of the coils 10 may be 0.1 mm to 0.4 mm, and the surface of the coils 10 may be made of any one of Pb, Sn, Zn, Ag, and Ni Or plated with an alloy thereof is preferably used.

Here, the braided structure may vary depending on the diameter of the braided object and the purpose of braiding, but in the present embodiment, the number of the braided wires 10 is set to 7 . At this time, the braid layer 140 is woven at a braid density of 70% or more so as to maintain a shielding ratio of 40 dB or more.

The outer sheath layer 150 is provided at the outermost portion of the cable 1000 to protect the cable 1000 from external impact or corrosion. Like the inner sheath layer 130, the outer sheath layer 150 can be made of thermoplastic or thermosetting materials such as PVC, HF4-1, SHF1, and chloroprene.

The outer sheath layer 150 is not essential for the control signal transmission cable 1000 and may be omitted as an example of the control signal transmission cable 1000-2 shown in FIGS.

Table 2 shows the shielding performance and the braided weight of the control signal transmission cable manufactured by applying the coaxial cable 10 according to the present invention to a shielded braid.

product product
standard Wire rod Small diameter
(Copper thickness)
Mm Indices steersman pitch
(mm) Braided
Bottom
(mm) Braided
density Shielding rate (db) Braided weight
(kg / km) 1.75MHz 6 MHz 10MHz TFR-
CVV-SB
600V 3 X
1.5
SQ Cu 0.16
(0.16) 9 16 27.26 13.32 75% 72.01 66.11 62.93 49.60 Cloth
Carbon fiber 0.16
(0.006) 72.17 63.93 60.87 19.63 Maternity Meta
Aramid 0.16
(0.006) 71.89 65.87 61.79 18.27

The length of the measurement sample was 1.5 m, and the measurement frequency was 500 kHz to 108 MHz. The measurement position was measured at the entire length of the sample, and the tensile strength of the conductive fiber, carbon fiber and meta-aramid was applied by working at 1 kgf.

As a result, it was found that the cable using the copper-clad carbon fiber and the copper-clad meta-aramid as the braiding layer for shielding showed a shielding performance similar to that of the cable using the braiding layer made of copper wire at 1.75 MHz to 10 MHz, %.

The control signal transmission cable according to the embodiments of the present invention, which is manufactured by applying the coaxial wire and the braid for the shielding, has the following effects.

First, the coiling wire produced according to the conditions of the present invention has a low probability of occurrence of disconnection even when the braiding process is performed in a facility set equal to the braiding level of the copper wire. This is because a conductive material having a tensile force of 0.15 kgf to 4 kgf is applied as an extension wire so that the wire rod strength is maintained at a certain level or more.

Second, high convenience can be guaranteed when the operator performs cable laying work. As described above, the cable to which the coaxial wire according to the present invention is applied by braiding has a good characteristic, but its weight is reduced to less than half of that of the case where copper is applied. Therefore, the cable is hand- can do. In addition, when folding or folding the braid for grounding, it is easier and easier to work than braid made of copper wire.

Third, as a result of applying the conductive material with low price compared to copper, the conductor and the braided material using the copper wire material are about one third to one half of the braided material using the copper wire material. Accordingly, since the cost of the braid material is reduced to less than half, the cost of the cable as a whole is reduced, and the cost saving effect can be expected.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention as defined in the appended claims. You can do it. It is therefore to be understood that the modified embodiments are included in the technical scope of the present invention if they basically include elements of the claims of the present invention.

10: Copper wire Rod 20: Wire
112: conductor layer 116: insulating layer
130: Inner sheath layer 140: Braided layer
150: outer sheath layer 1000: control signal transmission cable

Claims (14)

An extension made of conductive material; And
An outer line surrounding the extension and made of copper,
Wherein shielding is performed at a frequency of 1.75 MHz to 250 MHz, and a tensile force of the conductive material forming the extension is 0.15 kgf to 4 kgf. The method according to claim 1,
The thickness of the outer line is

And a value determined by the following equation: " (1) " The method according to claim 1,
Wherein the conductive material is made of any one of carbon fiber, meta-aramid, aluminum, nickel, magnesium, titanium, and CNT. The method according to claim 1,
And the total diameter including the extension line and the outer line is 0.1 mm to 0.4 mm. The method according to claim 1,
And a plating layer plated with any one of Pb, Sn, Zn, Ag, and Ni or an alloy thereof for preventing corrosion on the external line. A plurality of signal transmission units each having a conductor layer formed by stranding, aggregating, or compounding a plurality of wires, and an insulating layer insulating the conductor layer; And
And a braided layer formed outside the plurality of signal transmission units to perform shielding,
Wherein the braided layer is woven with a coaxial wire including an extension made of a conductive material and an outer wire made of copper surrounding the extension, the coaxial wire performing shielding at a frequency of 1.75 MHz to 250 MHz, And the tensile force is 0.15 kgf to 4 kgf. The method according to claim 6,
Wherein the insulation layer is formed by extruding the separator tape to surround the conductor layer, and the insulating layer is formed by extruding the separator tape so as to surround the separator tape. The method according to claim 6,
A filler filled to maintain a circular shape between the plurality of signal transmission units and a binder tape wrapping around the plurality of signal transmission units and the filler,
Wherein the plurality of signal transmission units, the filler, and the binder tape form a core portion. 9. The method of claim 8,
Further comprising an inner sheath layer disposed between the core and the braided layer and surrounding the core. The method according to claim 6,
And an outer sheath layer surrounding the outer side of the braided layer. 11. The method according to any one of claims 6 to 10,
The thickness of the outer line is

And a value determined by the following equation: " (1) " 11. The method according to any one of claims 6 to 10,
Wherein the conductive material is made of any one of carbon fiber, meta-aramid, aluminum, nickel, magnesium, titanium, and CNT. 11. The method according to any one of claims 6 to 10,
And the total diameter including the extension line and the outer line is 0.1 mm to 0.4 mm. 11. The method according to any one of claims 6 to 10,
And a plating layer plated with any one of Pb, Sn, Zn, Ag, and Ni or an alloy thereof for preventing corrosion on the external line.

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